Games like One/Iro
Games like One/Iro include Poppy Playtime, Outer Wilds, What Remains of Edith Finch, SOMA, and Inside the Backrooms. We matched them by the tags players give One/Iro on Steam (Adventure, Puzzle, Exploration, 3D, and First-Person): closest matches first, and among equally close ones the better-known games.

Poppy Playtime
Shared: Puzzle · First-Person · Dark

Outer Wilds
Shared: Exploration · Adventure · Puzzle

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Exploration

SOMA
Shared: Atmospheric · Psychological Horror · Exploration

Inside the Backrooms
Shared: Puzzle · Adventure · Exploration

Little Nightmares II
Shared: Adventure · Puzzle · Atmospheric

Riven
Shared: Adventure · Puzzle · Exploration

Firewatch
Shared: Adventure · Atmospheric · First-Person

Little Nightmares
Shared: Adventure · Atmospheric · Puzzle

MiSide
Shared: Psychological Horror · First-Person · 3D

The Talos Principle
Shared: Puzzle · First-Person · Atmospheric

Blue Prince
Shared: Puzzle · Exploration · Adventure

COCOON
Shared: Adventure · Puzzle · Exploration

Layers of Fear (2016)
Shared: Atmospheric · First-Person · Psychological Horror

ROUTINE
Shared: Adventure · Atmospheric · Psychological Horror

Sally Face - Episode One
Shared: Puzzle · Adventure · Psychological Horror

Amnesia: Rebirth
Shared: Puzzle · First-Person · Adventure

Amnesia: The Dark Descent
Shared: Puzzle · Atmospheric · Psychological Horror

The Witness
Shared: Puzzle · Exploration · First-Person

PEAK
Shared: Adventure · Exploration · First-Person

The Room Three
Shared: Puzzle · Adventure · Atmospheric

Stray
Shared: Adventure · Exploration · Atmospheric

Garten of Banban
Shared: First-Person · Puzzle · 3D

Scanner Sombre
Shared: Exploration · Adventure · Atmospheric